| Schedule of changes in the carrying amounts of goodwill by reportable segment |
| | | | | | | | | | | | | | Water | | Water | | | | | | | Infrastructure | | Services | | Total | | | | | (in thousands) | Balance as of December 31, 2024 | | | $ | 16,777 | | $ | 1,438 | | $ | 18,215 | Additions | | | | — | | | — | | | — | Balance as of March 31, 2025 | | | $ | 16,777 | | $ | 1,438 | | $ | 18,215 |
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| Summary of components of other intangible assets |
| | | | | | | | | | | | | | | | | | | | | As of March 31, 2025 | | As of December 31, 2024 | | | Gross | | Accumulated | | Net | | Gross | | Accumulated | | Net | | | Value | | Amortization | | Value | | Value | | Amortization | | Value | | | | (in thousands) | | (in thousands) | Definite-lived | | | | | | | | | | | | | | | | | | | Customer relationships | | $ | 187,706 | | $ | (80,498) | | $ | 107,208 | | $ | 187,706 | | $ | (76,638) | | $ | 111,068 | Patents and other intellectual property | | | 14,272 | | | (8,905) | | | 5,367 | | | 14,272 | | | (8,521) | | | 5,751 | Water rights | | | 1,750 | | | (269) | | | 1,481 | | | 3,125 | | | (1,510) | | | 1,615 | Total definite-lived | | | 203,728 | | | (89,672) | | | 114,056 | | | 205,103 | | | (86,669) | | | 118,434 | Indefinite-lived | | | | | | | | | | | | | | | | | | | Water rights | | | 5,281 | | | — | | | 5,281 | | | 5,281 | | | — | | | 5,281 | Total indefinite-lived | | | 5,281 | | | — | | | 5,281 | | | 5,281 | | | — | | | 5,281 | Total other intangible assets, net | | $ | 209,009 | | $ | (89,672) | | $ | 119,337 | | $ | 210,384 | | $ | (86,669) | | $ | 123,715 |
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